arch/arm/mach-davinci/common.c

   1 /*
   2  * Code commons to all DaVinci SoCs.
   3  *
   4  * Author: Mark A. Greer <mgreer@mvista.com>
   5  *
   6  * 2009 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/io.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/davinci_emac.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <asm/tlb.h>
  18 #include <asm/mach/map.h>
  19
  20 #include <mach/common.h>
  21 #include <mach/cputype.h>
  22
  23 #include "clock.h"
  24
  25 struct davinci_soc_info davinci_soc_info;
  26 EXPORT_SYMBOL(davinci_soc_info);
  27
  28 void __iomem *davinci_intc_base;
  29 int davinci_intc_type;
  30
  31 void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context)
  32 {
  33         char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
  34         off_t offset = (off_t)context;
  35
  36         /* Read MAC addr from EEPROM */
  37         if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
  38                 pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
  39 }
  40
  41 static int __init davinci_init_id(struct davinci_soc_info *soc_info)
  42 {
  43         int                     i;
  44         struct davinci_id       *dip;
  45         u8                      variant;
  46         u16                     part_no;
  47         void __iomem            *base;
  48
  49         base = ioremap(soc_info->jtag_id_reg, SZ_4K);
  50         if (!base) {
  51                 pr_err("Unable to map JTAG ID register\n");
  52                 return -ENOMEM;
  53         }
  54
  55         soc_info->jtag_id = __raw_readl(base);
  56         iounmap(base);
  57
  58         variant = (soc_info->jtag_id & 0xf0000000) >> 28;
  59         part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
  60
  61         for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
  62                         i++, dip++)
  63                 /* Don't care about the manufacturer right now */
  64                 if ((dip->part_no == part_no) && (dip->variant == variant)) {
  65                         soc_info->cpu_id = dip->cpu_id;
  66                         pr_info("DaVinci %s variant 0x%x\n", dip->name,
  67                                         dip->variant);
  68                         return 0;
  69                 }
  70
  71         pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
  72         return -EINVAL;
  73 }
  74
  75 void __init davinci_common_init(struct davinci_soc_info *soc_info)
  76 {
  77         int ret;
  78
  79         if (!soc_info) {
  80                 ret = -EINVAL;
  81                 goto err;
  82         }
  83
  84         memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
  85
  86         if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
  87                 iotable_init(davinci_soc_info.io_desc,
  88                                 davinci_soc_info.io_desc_num);
  89
  90         init_consistent_dma_size(14 << 20);
  91
  92         /*
  93          * Normally devicemaps_init() would flush caches and tlb after
  94          * mdesc->map_io(), but we must also do it here because of the CPU
  95          * revision check below.
  96          */
  97         local_flush_tlb_all();
  98         flush_cache_all();
  99
 100         if (!davinci_soc_info.reset)
 101                 davinci_soc_info.reset = davinci_watchdog_reset;
 102
 103         /*
 104          * We want to check CPU revision early for cpu_is_xxxx() macros.
 105          * IO space mapping must be initialized before we can do that.
 106          */
 107         ret = davinci_init_id(&davinci_soc_info);
 108         if (ret < 0)
 109                 goto err;
 110
 111         if (davinci_soc_info.cpu_clks) {
 112                 ret = davinci_clk_init(davinci_soc_info.cpu_clks);
 113
 114                 if (ret != 0)
 115                         goto err;
 116         }
 117
 118         return;
 119
 120 err:
 121         panic("davinci_common_init: SoC Initialization failed\n");
 122 }